Harbor freight has a bench grinder with a polishing wheel and some cheap composed for less than $50 last time I was there. I just don’t have anywhere to put it but it’s fairly small. Prob about a foot wide.
Hell, here’s one for $30 bucks and comes with a cotton polishing wheel.
https://www.harborfreight.com/3-inch-mini-tool-grinder-polisher-94071.html
You just need to buy a finer polishing wheel and some good compounds.
I just use my polishing drill bit, clamp it down to a bench and use it that way when polishing a case. Then I use my dremel for smaller work.
You can get great results from just using very fine sandpaper as well. I use something called finish sand paper. The finest one feels like paper but it damn sure polishes it. It’s just very time consuming but for work like polishing the chamfered edges, it comes in handy. I just wrap it around flat sanding pad and keep it at a 45 degree angle.
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